Between these we have some other kinds. There's the "completable list" - like Comprehensive list of WOTC D&D 4.0 products?Comprehensive list of WOTC D&D 4.0 products? It's a long list, but won't change any more because 4.0 is over.
And the "maybe answer with a list, maybe with a resource" questions like Is there a list of wizard spells by level by school?Is there a list of wizard spells by level by school? where the best answer is a link to an online spell DB or whatnot.
And then there's the "short list, but no one knows how short when the question's asked really" questions like Sets of spells that have explicit bonuses when used togetherSets of spells that have explicit bonuses when used together, or the thunder-and-lightning question and its linked concentration question.